Which statement correctly compares a carburetor-to-fuel-injection throttle body induction system?

Which statement correctly compares a carburetor-to-fuel-injection throttle body induction system?

• A. A throttle body meters fuel by airflow through a venturi; a carburetor meters fuel electronically based on engine data
• B. A carburetor meters fuel by airflow through a venturi; a throttle body with injectors meters fuel electronically based on engine data
• C. Both meters fuel by direct electronic control; no difference
• D. A throttle body uses mechanical linkage to measure airflow; carburetor uses fuel rail pressure sensor

Answer: (B)

The main idea here is how fuel is metered in these two induction setups. In a carburetor, fuel metering is mechanical and driven by the airflow through a venturi. The air passing through the narrow throat creates a pressure drop that pulls fuel from jets and the float bowl, with mixture tuned by jet sizes and settings—no electronic data used. In a throttle-body injection system, fuel is delivered by electronic injectors into the intake and the amount is controlled by the engine control unit based on sensor data such as airflow, pressure, temperature, and RPM. So the best description is that a carburetor meters fuel by airflow through a venturi, while a throttle body with injectors meters fuel electronically based on engine data.

The main idea here is how fuel is metered in these two induction setups. In a carburetor, fuel metering is mechanical and driven by the airflow through a venturi. The air passing through the narrow throat creates a pressure drop that pulls fuel from jets and the float bowl, with mixture tuned by jet sizes and settings—no electronic data used. In a throttle-body injection system, fuel is delivered by electronic injectors into the intake and the amount is controlled by the engine control unit based on sensor data such as airflow, pressure, temperature, and RPM. So the best description is that a carburetor meters fuel by airflow through a venturi, while a throttle body with injectors meters fuel electronically based on engine data.